Synthesis and enhanced visible light-induced photocatalytic activity of a hierarchical porous biomorphic N/Zn–TiO2@NH2-MIL-125 photocatalyst
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Heterojunction is considered as very promising material for various applications in photocatalysis. Herein, an efficient heterojunction photocatalyst N/Zn–TiO2@NH2-MIL-125 was successfully synthesized for photo-degradation organic oxidation by biological-templated method. The electron–hole pairs can be separated in space more efficiently because of heterojunction structure. Systematical analyses of spectroscopy and microscopy measurements revealed that N/Zn–TiO2@NH2-MIL-125 heterojunction materials exhibited hierarchical porous structure with high surface area of 366.02 m2 g−1 and outstanding optical properties. Photocatalytic activity was investigated by degradating of rhodamine B (1000 µM) under visible-light irradiation. The N/Zn–TiO2@NH2-MIL-125 showed enhanced photocatalytic activity for RhB degradation, which is respectively about 1.81 and 1.97 times higher than that of the pristine N/Zn–TiO2 and NH2-MIL-125. Various advanced spectroscopic characterizations were applied including photoluminescence, Mott–Schottky curves and electrochemical impedance spectroscopy. A possible mechanism of enhanced photocatalytic oxidation activity for N/Zn–TiO2@NH2-MIL-125 composite under visible light irradiation was discussed.
This work was financially supported by the Natural Science Foundation of Hubei Provincial China (2017CFC829, 2017CFB291), National Natural Science Foundation of China (61604110, 51802234), Key Technology R&D Program of Hubei Province (2015BCA253), China Postdoctoral Science Foundation (2015M572210, 2016M602376), Department of Education Science Research Program of Hubei Province (Q20161110), and Open Foundation of Key Laboratory of Green Chemical Process (Wuhan Institute of Technology), Ministry of Education (NRGCT201503), Training Programs of Innovation and Entrepreneurship for Undergraduates of Province (201510488022), Guidance Project of Scientific Research Plan of Hubei Provincial Department of Education (B2017014) and Key Projects of Scientific Research Program of Hubei Provincial Department of Education (D20171505). This work was also financially supported by the China Scholarship Council (201708420021) for Dr. Hui Chen.
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